configs/ti_am64x_sk_defconfig: update kernel to v6.8.8

Update to the latest kernel to pull in the latest bug fixes and features
for TI's SoCs and reference boards

Signed-off-by: Bryan Brattlof <bb@ti.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/ti/am64x-sk/patches/linux/linux.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256  4e43d8c5fba14f7c82597838011648056487b7550fd83276ad534559e8499b1d  linux-6.6.18.tar.xz
+sha256  1c4cdcb9d560fad1fb95db2cb8afbedc922f9ead848371fe40363b13f9f631ba  linux-6.8.8.tar.xz

configs/ti_am64x_sk_defconfig

@@ -1,5 +1,5 @@
 BR2_aarch64=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_8=y
 BR2_GLOBAL_PATCH_DIR="board/ti/am64x-sk/patches"
 BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/ti/common/am6xx/post-build.sh"
@@ -8,7 +8,7 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT_ARGS="-c board/ti/am64x-sk/genimage.cfg"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.18"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.8.8"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="ti/k3-am642-sk"